Surveillance for avian influenza in Maanshan, Anhui, 2009−2021

  Objective   To analyze the surveillance data of avian influenza virus in external environment in Maanshan from 2009 to 2021 and provide scientific evidence for the improvement of avian influenza surveillance and the prevention and control of human infection with avian influenza virus.

  Methods   A total of 1602 environment samples from 2009 to 2021 were collected from live poultry markets, large poultry farms, free range poultry farms and poultry processing plants, respectively, for the detection of the nucleic acid of avian influenza virus by real-time fluorescence quantitative PCR, and the results were analyzed statistically.

  Results   The positive rate of the nucleic acid of avian influenza virus was 17.92% in 1602 samples in external environment surveillance . The positive samples were mostly detected in winter and in live poultry markets. The positive rate was highest in poultry sewage samples. The main sub-type of influenza A virus was H9.

  Conclusion  Live poultry market is still the high risk place for human infection with avian influenza virus from 2009 to 2021. It is necessary to strengthen the surveillance for avian influenza virus in live poultry markets in key areas during winter-spring, and implement fully the hygiene managements measures in live poultry markets.